Which of the following does NOT contribute to the virulence of a pathogen?
A) cell envelope;
B) toxins;
C) enzymes;
D) number of microorganisms that gain access/entry to the host
Ans: D) number of microorganisms that gain access/entry to the host
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Of the following organisms, which can be described as a fastidious obligate intracellular parasite that multiplies by binary fission in the cytoplasm of host cells and infects humans as accidental hosts in most cases?
a. Rickettsia b. Chlamydia c. Calymmatobacterium d. Coxiella
The scientist who received the first Nobel Prize in Medicine for his work on antibody therapy was
A. Koch. B. von Behring. C. Jenner. D. Roux.
Which of the following is a consequence of histamine release?
A) Decreased blood flow B) Constriction of the smooth muscle that surrounds arterioles C) Initiation of blood clotting D) Leaky capillary walls
When species evolve in different directions from a common point, it is called ______________.
A. Convergent evolution B. Divergent evolution C. Mutation D. Vicariance E. Natural selection